The jihadi revealed his hatred for his captors in an interview after his release, saying he wanted to “spit in the faces” of the soldiers and guards.

Speaking about the moment he was freed, he told the BBC: “I was very angry actually.

“First when they told me I was scared because I had been in a cage for so long I didn't want to leave, strange as it might sound.

“When they were taking us out I could see the British plane waiting for us - they had to walk us over the 300 metres - and we got put in front to the British Bobby and the American soldier was taking off my chains I wanted to spit in his face but you have to hold yourself inside.”

Shukee Begum, Al-Harith's British wife, revealed he had gone to Syria when she fled ISIS

Who was Jamal al-Harith?

MUSLIM convert Jamal al-Harith was freed from the infamous US detention centre in 2004 after then-Home Secretary David Blunkett campaigned for his release.

At the time of al-Harith’s release from Guantanamo Bay, Mr Blunkett, said: “No one who is returned…will actually be a threat to the security of the British people.”

The ex-Labour cabinet member initially opposed the return of British Guantanamo Bay detainees.

He wanted the captives tried in American civil courts because he feared trials in the UK could collapse because of the conditions they were held in, in the United States.

When al-Harith was released in 2004, he was repatriated to England and released without charge.

Footage of his attack shows a pack of suicide cars stuffed with bombs and encased in armour travelling near Mosul.

It later shows another fighter cheering before he shuts the driver-side door and pulls off.

Moments later giant clouds of smoke can be seen in the distance.

At least two of the jihadis managed to reach a base west of the city where they detonated their explosives — killing and injuring a number of troops, the Iraqi soldiers said.

The extremists later released a statement saying: "The martyrdom-seeking brother Abu Zakariya al-Britani — may Allah accept him — detonated his explosives-laden vehicle on a headquarters of the Rafidhi army and its militias in Tal Kisum village, southwest of Mosul."

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His brother Brian Jameson told The Sun: “Ronald’s a good bloke. He’s kind and caring — nothing like the man who would do this.

"I know he had become more extremist over the years but I spoke to him a few months back and he seemed just like the brother I knew. I’m devastated.”

The end of his fighting name — al-Britani — is commonly used by ISIS to identify jihadists from Britain.

But the Foreign Office has said due to the nature of the conflict it is unable to fully verify dead Brit fighters.

A spokesperson told The Sun: "As all UK consular services are suspended in Syria and greatly limited in Iraq, it is extremely difficult to confirm the whereabouts and status of British Nationals in these areas.”

It is estimated that about 850 British citizens have fled the country and travelled to Syria or Iraq to join the terror group.

Iraqi forces have been waging war with ISIS fighters in Mosul since last October, when a massive US-led offensive was launched to re-capture the terror stronghold.

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